GetPerformanceInfo function (psapi.h)

Retrieves the performance values contained in the PERFORMANCE_INFORMATION structure.

BOOL GetPerformanceInfo(
  [out] PPERFORMANCE_INFORMATION pPerformanceInformation,
  [in]  DWORD                    cb
);

[out] pPerformanceInformation

A pointer to a PERFORMANCE_INFORMATION structure that receives the performance information.

[in] cb

The size of the PERFORMANCE_INFORMATION structure, in bytes.

If the function succeeds, the return value is TRUE. If the function fails, the return value is FALSE. To get extended error information, call GetLastError.

Starting with Windows 7 and Windows Server 2008 R2, Psapi.h establishes version numbers for the PSAPI functions. The PSAPI version number affects the name used to call the function and the library that a program must load.

If PSAPI_VERSION is 2 or greater, this function is defined as K32GetPerformanceInfo in Psapi.h and exported in Kernel32.lib and Kernel32.dll. If PSAPI_VERSION is 1, this function is defined as GetPerformanceInfo in Psapi.h and exported in Psapi.lib and Psapi.dll as a wrapper that calls K32GetPerformanceInfo.

Programs that must run on earlier versions of Windows as well as Windows 7 and later versions should always call this function as GetPerformanceInfo. To ensure correct resolution of symbols, add Psapi.lib to the TARGETLIBS macro and compile the program with –DPSAPI_VERSION=1. To use run-time dynamic linking, load Psapi.dll.

Memory Performance Information

PERFORMANCE_INFORMATION

PSAPI Functions